Ōki Yaba (ヤバ オウキ, Yaba Ooki) is a minor character in Season 2 and a supporting character in Season 3 of Alice in Borderland. He is portrayed by Katsuya Maiguma.
Yaba is a middle-aged man who cuts an imposing yet refined figure. With his tall, muscular frame and broad shoulders, he carries himself with natural authority and confidence. His black hair is cut in a slicked back side part, accentuating bold, discerning features that include a slight mustache above his prominent jawline. Overall the hair appears structured yet not overly styled or fussy.
Yaba wears a fully black suit with dark grey pinstripes flowing downwards, a black tie, and a white shirt beneath his suit jacket. In the left breast pocket of his suit there is a neatly folded white handkerchief.
Yaba maintains a cold, calculating and logical demeanor in all situations. He is always analyzing and evaluating based on facts rather than emotions while remaining calm and collected. He is detached, preferring to engage with the external realities before him rather than retreating inward for reflection. As someone with charisma and confidence, he engages with the external environment in a strategic manner. Underneath this, Yaba is an extremely manipulative person, which made him successful in the Jack of Hearts game. He manipulated a woman into apparent total loyalty by his own admission.